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Plus one on trying them on. As already stated, the manufacturers make them for the various head shapes. I was educated on this at an IMS Cycle show in Chicago two helmets ago. I went there with all my research involving reviews and weights etc. All set to purchase a model I no longer recall. The guy working the International Market Place where they displayed products and did not sell obliged me by letting me experience the fit of my intended model. He was 100% correct, it was not the helmet for me. He told me which one was going to fit my head but again, let me try others. He knew his helmets and I was not surprised as I had eavesdropped a little while waiting for him to finish with another patron. His recommendation for me was Shoei and it fit perfectly. I use the modular and replace them every five years so come to think about it, I am about due for another.

Sorry, the guy who made those passed away years ago. I don't remember any matching gauges specifically but there were a number of matching gauges from different manufacturers that would work.

Ronnie, I used to think brands mattered as a #1 priority. Brand is important but the shape of your head vs different brands is much more so! Different brands fit oval heads better.... And narrow heads... And round heads. I found out by going to my local Cycle Gear and let the sales person check my head out.... Seriously! HJC fits my head well... So it's a brand I look at. I also don't worry to much about noise as I wear earplugs or noise reducing ear buds. What's more important to me is how strong is the latch that closes the modular and how easy is it to raise/lower the clear shield and sun shields. I like the pin lock on mine.. Very easy to swap shields. Comfort and usability are top on the list for me.... Hope this helps! P.S. my current helmet is HJC. I also found the Scorpions EXO helmets fit me well.